This could explain why large parts of the population have a tendency to lay down fat stores easily.這就可以解釋為什么大多數人都有易于儲存脂肪的傾向

part of:一部分

This piece of glass seems to be part of a lamp.

這片玻璃似乎是一盞燈的一部分。

There will be rain in all parts of the country.

全國各地將有雨。

So if evolution was selecting for fatness,如果說肥胖是進化的選擇

select for:選擇

What kind of people should we select for future leading bodies?

我們今后配備領導班子的時候，要選用什么人呢?

詞義辨析:

choose，select均含有“選擇”之意。

choose普通用詞，側重根據個人意愿和判斷從眾多的對象中進行選擇，著重被選者的優點。

The greedy boy chose the largest apple in the dish.那貪心的孩子從盤中挑了一個最大的蘋果。

You may choose from them the one you like best.你可從它們中間選出你最喜歡的一個。

select書面用詞，具有莊嚴、正式的感情色彩。強調精選。

They selected a diamond engagement ring.他們挑選了一枚鉆石訂婚戒指。

Why didn't you select a nice subject?你為什么沒選一個好題目?